package com.atjava.nebula.web.security;

import java.util.Collection;
import java.util.Iterator;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;

public class NebulaAccessDecisionManager implements AccessDecisionManager {

	public void decide(Authentication authentication, Object object,
			Collection<ConfigAttribute> configAttributes)
			throws AccessDeniedException, InsufficientAuthenticationException {

		if (configAttributes == null)
			return;
		
		Iterator<ConfigAttribute> it = configAttributes.iterator();
		while (it.hasNext()) {
			String needRole = it.next().getAttribute();
			for (GrantedAuthority grantAuth : authentication.getAuthorities()) {
				if (needRole.equals(grantAuth.getAuthority())) {
					return;
				}
			}
		}
		throw new AccessDeniedException("认证失败，没有权限访问！");

	}

	public boolean supports(ConfigAttribute attribute) {

		return true;
	}

	public boolean supports(Class<?> clazz) {

		return true;
	}

}
